1. If you add air to a flat tire through a single small entry hole, why does the air spread out to fill the tire?

Idon’t quite understand this problem

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.